Disable Superfetch & Prefetch while gaming? in Game Booster v3 & Razer Game Booster Posted February 10, 2018 I've faced this issue before while gaming so I would suggest to disable it. This is caused by 100% CPU usage so to solve service host superfetch error, you've to disable superfetch and you can do this by following the steps below. For detailed guide check: https://clouttechie.com/solved-service-host-superfetch-high-disk-space-usage-error/ One of the following steps will sort out the problem: 1.Disable from services - Run command services.msc and then disable superfetch. 2.Disable from Registry using Regedit command.